package com.lpx.demo.demo.controller;

import com.alibaba.druid.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

@RestController
@RequestMapping("/ip")
public class IpController {

    @RequestMapping("/getIp")
    public String getIp(HttpServletRequest request){
        String ip = null;

        // 处理代理情况
        ip = request.getHeader("x-forwarded-for");
        if (StringUtils.isEmpty(ip)
                || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (StringUtils.isEmpty(ip)
                || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (StringUtils.isEmpty(ip)
                || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if (ip.equals("127.0.0.1")) {
                InetAddress inet = null;// 根据网卡取本机配置的IP
                try {
                    inet = InetAddress.getLocalHost();//idea-PC/192.168.212.144
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ip = inet.getHostAddress();//192.168.212.144
            }
        }
        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割,多级代理的时候会得到多个以,分割的ip，
        //这时候第一个是真实的客户端ip
        if (ip != null && ip.length() > 15) { // "***.***.***.***".length()
            if (ip.indexOf(",") > 0) {
                ip = ip.substring(0, ip.indexOf(","));
            }
        }
        System.out.println(ip);
        return ip;
    }
}
